Arising of Firms and the Right of Residual Control——A Discussion with YANG Xiao-kai;

The Contribution of Professor YANG Xiao-kai to International Trade Theory;

This article includes two notes of Hui tribe history research regarding Yang Kai family and Sa Zhenbing family,with some supplementary new materials.

A Study on the Stem Sap Flow of Individual Trees of Populus simonii under Different Weather Conditions in Rainy Season in Guanting Reservoir;

Species Diversity and Community Stability of Populus simonii Plantations in Different Habitats in Hilly Area of the Loess Plateau;

Transformation of Hybrid Larch(Larix leptolepis× L. olgensis) with CMO Gene Cloned from Populus simonii cDNA Library;

The extraction procedure of chlorophyll from Buxus microphylla and the application;

Growth of Populus simonii×P.nigra Which Were Cultivated on Different Types of Chernozem;

Study on the Sensitivity of Hygromycin on Populus simonii×P.nigra;

Determination of Felling Period of Short-Period Pulp Plantation of Populus simonii×P.nigra;

Growth Characteristic of Populus×xiaohei Plantaion in Sand Land of North China;

Biomass and Distribution Patterns of Populus×xiaohei Plantation in Sandy Land of North China;

Effects of Planting Density on Growth Increment of Juvenile and Mature Wood in Populus×xiaohei;